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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2013-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.services.s3.internal.crypto;

import java.security.SecureRandom;

import com.amazonaws.services.s3.model.CryptoMode;

/**
 * S3 cryptographic scheme that includes the content crypto scheme and key
 * wrapping scheme (for the content-encrypting-key).
 */
final class S3CryptoScheme {
    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html
    // http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/CryptoSpec.html#Key
    static final String AES = "AES"; 
    static final String RSA = "RSA"; 
    private static final SecureRandom srand = new SecureRandom();
    private final S3KeyWrapScheme kwScheme;

    private final ContentCryptoScheme contentCryptoScheme;

    private S3CryptoScheme(ContentCryptoScheme contentCryptoScheme,
            S3KeyWrapScheme kwScheme) {
        this.contentCryptoScheme = contentCryptoScheme;
        this.kwScheme = kwScheme;
    }

    SecureRandom getSecureRandom() { return srand; }
    
    ContentCryptoScheme getContentCryptoScheme() {
        return contentCryptoScheme;
    }

    S3KeyWrapScheme getKeyWrapScheme() { return kwScheme; }

    /**
     * Convenient method.
     */
    static boolean isAesGcm(String cipherAlgorithm) {
        return ContentCryptoScheme.AES_GCM.getCipherAlgorithm().equals(cipherAlgorithm);
    }

    static S3CryptoScheme from(CryptoMode mode) {
        switch (mode) {
        case EncryptionOnly:
            return new S3CryptoScheme(ContentCryptoScheme.AES_CBC,
                    S3KeyWrapScheme.NONE);
        case AuthenticatedEncryption:
        case StrictAuthenticatedEncryption:
            return new S3CryptoScheme(ContentCryptoScheme.AES_GCM,
                    new S3KeyWrapScheme());
        default:
            throw new IllegalStateException();
        }
    }
}